blob: 6034ee53ba68d6347a5865b05d8f0b296e8442c0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
package util
import (
"unicode/utf8"
)
type Chars struct {
runes []rune
bytes []byte
}
// ToChars converts byte array into rune array
func ToChars(bytea []byte) Chars {
var runes []rune
ascii := true
numBytes := len(bytea)
for i := 0; i < numBytes; {
if bytea[i] < utf8.RuneSelf {
if !ascii {
runes = append(runes, rune(bytea[i]))
}
i++
} else {
if ascii {
ascii = false
runes = make([]rune, i, numBytes)
for j := 0; j < i; j++ {
runes[j] = rune(bytea[j])
}
}
r, sz := utf8.DecodeRune(bytea[i:])
i += sz
runes = append(runes, r)
}
}
if ascii {
return Chars{bytes: bytea}
}
return Chars{runes: runes}
}
func RunesToChars(runes []rune) Chars {
return Chars{runes: runes}
}
func (chars *Chars) Get(i int) rune {
if chars.runes != nil {
return chars.runes[i]
}
return rune(chars.bytes[i])
}
func (chars *Chars) Length() int {
if chars.runes != nil {
return len(chars.runes)
}
return len(chars.bytes)
}
// TrimLength returns the length after trimming leading and trailing whitespaces
func (chars *Chars) TrimLength() int {
var i int
len := chars.Length()
for i = len - 1; i >= 0; i-- {
char := chars.Get(i)
if char != ' ' && char != '\t' {
break
}
}
// Completely empty
if i < 0 {
return 0
}
var j int
for j = 0; j < len; j++ {
char := chars.Get(j)
if char != ' ' && char != '\t' {
break
}
}
return i - j + 1
}
func (chars *Chars) TrailingWhitespaces() int {
whitespaces := 0
for i := chars.Length() - 1; i >= 0; i-- {
char := chars.Get(i)
if char != ' ' && char != '\t' {
break
}
whitespaces++
}
return whitespaces
}
func (chars *Chars) ToString() string {
if chars.runes != nil {
return string(chars.runes)
}
return string(chars.bytes)
}
func (chars *Chars) ToRunes() []rune {
if chars.runes != nil {
return chars.runes
}
runes := make([]rune, len(chars.bytes))
for idx, b := range chars.bytes {
runes[idx] = rune(b)
}
return runes
}
func (chars *Chars) Slice(b int, e int) Chars {
if chars.runes != nil {
return Chars{runes: chars.runes[b:e]}
}
return Chars{bytes: chars.bytes[b:e]}
}
|